<template>
    <div>
        <button type="button" v-on:click="selectFile()" class="btn btn-white btn-default btn-round">
            <i class="ace-icon fa fa-upload"></i>
            {{text}}
        </button>
        <input class="hidden" type="file" ref="file" v-on:change="uploadFile()" v-bind:id="inputId+'-input'">
    </div>
</template>

<script>
    export default {
        name: 'big-file',
        props: {
            text: {
                default: "上传大文件"
            },
            inputId: {
                default: "file-upload"
            },
            suffixs: {
                default: []
            },
            shardSize: {
                default: 200 * 1024
            },
            url: {
                default: "oss-append"
            },
            use: {
                default: ""
            },
            afterUpload: {
                type: Function,
                default: null
            },
        },
        data: function () {
            return {}
        },
        methods: {
            uploadFile() {
                let _this = this;
                let formData = new window.FormData();
                let file = _this.$refs.file.files[0];

                console.log(JSON.stringify(file));
                /*
                  name: "test.mp4"
                  lastModified: 1901173357457
                  lastModifiedDate: Tue May 27 2099 14:49:17 GMT+0800 (中国标准时间) {}
                  webkitRelativePath: ""
                  size: 37415970
                  type: "video/mp4"
                */

                // 生成文件标识，标识多次上传的是不是同一个文件
                let key = hex_md5(file.name + file.size + file.type);
                let key10 = parseInt(key, 16);
                let key62 = Tool._10to62(key10);
                console.log(key, key10, key62);
                console.log(hex_md5(Array()));
                /*
                  d41d8cd98f00b204e9800998ecf8427e
                  2.8194976848941264e+38
                  6sfSqfOwzmik4A4icMYuUe
                 */

                // 判断文件格式
                let suffixs = _this.suffixs;
                let fileName = file.name;
                let suffix = fileName.substring(fileName.lastIndexOf(".") + 1, fileName.length).toLowerCase();
                let validateSuffix = false;
                for (let i = 0; i < suffixs.length; i++) {
                    if (suffixs[i].toLowerCase() === suffix) {
                        validateSuffix = true;
                        break;
                    }
                }
                if (!validateSuffix) {
                    Toast.warning("文件格式不正确！只支持上传：" + suffixs.join(","));
                    $("#" + _this.inputId + "-input").val("");
                    return;
                }

                // 文件分片
                let shardSize = _this.shardSize;    //以50kB为一个分片
                let shardIndex = 1;		//分片索引，1表示第1个分片
                let size = file.size;
                let shardTotal = Math.ceil(size / shardSize); //总片数

                let param = {
                    'shardIndex': shardIndex,
                    'shardSize': shardSize,
                    'shardTotal': shardTotal,
                    'use': _this.use,
                    'name': file.name,
                    'suffix': suffix,
                    'size': file.size,
                    'key': key62
                };

                _this.check(param);
            },

            /**
             * 检查文件状态，是否已上传过？传到第几个分片？
             */
            check (param) {
                let _this = this;
                _this.$ajax.get(process.env.VUE_APP_SERVER + '/file/admin/check/' + param.key).then((response)=>{
                    let resp = response.data;
                    if (resp.success) {
                        let obj = resp.content;
                        if (!obj) {
                            param.shardIndex = 1;
                            console.log("没有找到文件记录，从分片1开始上传");
                            _this.upload(param);
                        } else if (obj.shardIndex === obj.shardTotal) {
                            // 已上传分片 = 分片总数，说明已全部上传完，不需要再上传
                            Toast.success("文件极速秒传成功！");
                            _this.afterUpload(resp);
                            $("#" + _this.inputId + "-input").val("");
                        }  else {
                            param.shardIndex = obj.shardIndex + 1;
                            console.log("找到文件记录，从分片" + param.shardIndex + "开始上传");
                            _this.upload(param);
                        }
                    } else {
                        Toast.warning("文件上传失败");
                        $("#" + _this.inputId + "-input").val("");
                    }
                })
            },

            upload: function (param) {
                let _this = this;
                let shardIndex = param.shardIndex;
                let shardTotal = param.shardTotal;
                let shardSize = param.shardSize;
                let fileShard = _this.getFileShard(shardIndex, shardSize);
                // 将图片转为base64进行传输
                let fileReader = new FileReader();

                Progress.show(parseInt((shardIndex - 1) * 100 / shardTotal));

                fileReader.onload = function (e) {
                    let base64 = e.target.result;
                    // console.log("base64:", base64);

                    param.shard = base64;

                    _this.$ajax.post(process.env.VUE_APP_SERVER + '/file/admin/'+_this.url, param).then((response) => {
                        // Loading.hide();

                        let resp = response.data;
                        console.log("上传文件成功：", resp);
                        Progress.show(parseInt(shardIndex * 100 / shardTotal));
                        if (shardIndex < shardTotal) {
                            //上传下一个分片
                            param.shardIndex = param.shardIndex + 1;
                            _this.upload(param);
                        } else {
                            Progress.hide();
                            _this.afterUpload(resp);
                            $("#" + _this.inputId + "-input").val("");
                        }
                    });
                };
                fileReader.readAsDataURL(fileShard);
            },

            getFileShard: function (shardIndex, shardSize) {
                let _this = this;
                let file = _this.$refs.file.files[0];
                let start = (shardIndex - 1) * shardSize;//当前分片起始位置
                let end = Math.min(file.size, start + shardSize);//当前分片结束位置
                let fileShard = file.slice(start, end);//从文件中截取当前的分片数据
                return fileShard;
            },

            selectFile() {
                let _this = this;
                $("#" + _this.inputId + "-input").trigger("click");
            }
        }
    }
</script>
